Comparison

Motion Detector Camera vs SentryBlack

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Motion Detector Camera

This app transforms your device into a motion-detecting security camera. It uses advanced algorithms to detect movement, sound an alert, and automatically record video or capture images of detected objects. It's ideal for monitoring pets, securing your home, or any surveillance needs.

Highlights
  • Advanced motion detection algorithm
  • Automatic recording and image capture
  • Front/back camera support
  • Adjustable video/image sizes
  • Human, cat, or dog detection
  • Dimmable screen option
  • Date, time, and object type embedding
Features
Read full description

Motion Detector Camera is a camera surveillance app, that uses the built-in camera to detect movements in the surrounding area using an advanced motion detection algorithm. If it detects movement, it can sound beep to notify you. When the motion detection camera detects changes, it starts recording automatically. It will detect any moving object within camera view. This app enables you to use your iDevice as a remote surveillance camera with motion detection functionality. Features: - Support both front/back camera. - Support both portrait/landscape mode. - Camera pinch to zoom specific area. - Video/Image size range from 4k[supported device only]/fHD or HD - Switch between video or photo mode. - Detect Human, Cat or Dog. - Option to dime screen while recording. - Icon indicator while recording/photo capture. - Option to sound beep when motion detected. - Option to select difference sound tone for motion detection. - Surveillance images/videos are saved in the photo library for fast and easy access. - All images/videos are stored inside camera roll / Motion Detecter album. - Image capture with date, time, plus object type icon embed. - Video name with date, time and object type. E.g. 20200815-0530PM-dog.mp4 Tips: - Specific object you want to detect, select cat if you need to detect cat only. All other objects will be ignored. - Use dime screen option for battery saver. - Tap on the dime screen icon to dime screen. To wake up the screen just tap on the screen again. - Pinch to zoom to a specific area for monitoring. - Use small video/image size for smaller storage/energy footprint. - When in photo capture mode, images are captured for every 3 second interval. - In video capture mode, video capturing start once object is detected, video capturing stop when object is missing from the camera view. Usage: - Pet Monitor, see what your dog and cat are doing while you are busy. - Help secure homes and detects someone is in your home when they shouldn't be. - Anything else you can imagine. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

About

SentryBlack

Features
Read full description

Turn your own iPhone, iPad, or Mac into a private home security camera. Set an old device to watch a room and its screen dims to a discreet dark monitor view — one that always shows a clear recording indicator, so it is never hidden — while it detects motion, saves event clips, and streams live to your other devices. Wake it any time with a press-and-hold. PRIVATE BY DESIGN Unlike typical CCTV apps, SentryBlack has no company servers watching your home. Your video stays on YOUR devices and YOUR own private iCloud — never our cloud, and never a third-party cloud you did not choose. • Live view goes device-to-device and is end-to-end encrypted. • If your network blocks a direct connection, you can optionally add a relay server of your own — the video through it stays end-to-end encrypted and the relay cannot decrypt it. SentryBlack provides no relay server, and this setting is off unless you fill it in. • Cameras, motion alerts, and clips sync only through your private iCloud. • No account, no sign-up, no tracking. USE ANY DEVICE AS A CAMERA • The screen dims to a dark monitor view with an always-on "REC" indicator and timer — discreet and power-saving, but never blank. • On-device motion detection saves a clip and snapshot of every event. • Press and hold to wake the screen. MONITOR FROM ANYWHERE • On another device signed into the same iCloud, tap Monitor to see all your cameras. • Get instant push alerts with a snapshot the moment motion is detected. • Watch live video — fastest on the same Wi-Fi, and end-to-end encrypted everywhere. SENTRYBLACK PRO The free version records with motion detection, sends cross-device alerts, and streams live on your Wi-Fi (with a small banner ad on non-camera screens; iPhone and iPad only — the Mac app has no ads). SentryBlack Pro adds: • Cloud clip backup to your own iCloud • Unlimited event history • HD live view • Person detection & motion zones • Multiple cameras • No ads Pro is an auto-renewing subscription (monthly or yearly) with a 3-day free trial. One subscription works on iPhone, iPad, and Mac. Payment is charged to your Apple Account; it renews automatically unless cancelled at least 24 hours before the period ends. Manage or cancel anytime in Settings. Note: because Apple stops the camera when an app is in the background or the device is locked, a camera device must stay on and in the app while on duty — keeping it plugged in is recommended. Please use SentryBlack only to monitor your own property and spaces. Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://mwsupplylimited.github.io/sentryblack/privacy.html

Screenshots

Motion Detector Camera4 screens
SentryBlack4 screens

Verdict

The call

The clearest difference is price: SentryBlack at Free against Motion Detector Camera's $3.99. SentryBlack also leads on update cadence (fortnightly vs every 27 months). Motion Detector Camera's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

SentryBlack is free to download; Motion Detector Camera costs $3.99 up front. SentryBlack sells 2 in-app purchases, starting at $4.99 per month. Motion Detector Camera asks for nothing beyond the download.

UpkeepUpdate frequency

Motion Detector Camera ships an update every 27 months, SentryBlack fortnightly. The most recent releases landed on October 10, 2026 and October 3, 2026 respectively.

Scorecard5 real differences · 5 level
Motion Detector Camera versus SentryBlack: the parameters behind the verdict, then further details
ParameterMotion Detector CameraSentryBlack
Price$3.99Free — better
Rating2.0 (4 ratings) — better—
Positive reviews12.5% of reviews—
Number of ratings4 — better—
Update frequencyEvery 27 monthsFortnightly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS12.0 — better17.0
Further details — not scored
Size43 MB17 MB
Age rating4+4+
DeveloperHeng Jia LiangMatthew Wong

In-app purchases

None

Motion Detector Camera

No in-app purchases

2 purchases

SentryBlack

Subscriptions2
  • SentryBlack Pro (Monthly)3 Days trial$4.991 Month
  • SentryBlack Pro (Yearly)3 Days trial$29.991 Year

Questions

Is Motion Detector Camera free?
Motion Detector Camera costs $3.99, with no in-app purchases.
Is SentryBlack free?
SentryBlack is free to download, with in-app purchases available.
Do Motion Detector Camera or SentryBlack have ads?
SentryBlack shows ads; Motion Detector Camera does not.
Which is updated more often, Motion Detector Camera or SentryBlack?
Motion Detector Camera ships an update every 27 months, and SentryBlack fortnightly. Most recently, Motion Detector Camera was updated on October 10, 2026 and SentryBlack on October 3, 2026.

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